64978049 has 2 divisors, whose sum is σ = 64978050. Its totient is φ = 64978048.

The previous prime is 64978037. The next prime is 64978079. The reversal of 64978049 is 94087946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41280625 + 23697424 = 6425^2 + 4868^2 .

It is a cyclic number.

It is not a de Polignac number, because 64978049 - 2²⁴ = 48200833 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64977994 and 64978012.

It is not a weakly prime, because it can be changed into another prime (64978079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32489024 + 32489025.

It is an arithmetic number, because the mean of its divisors is an integer number (32489025).

Almost surely, 2^64978049 is an apocalyptic number.

It is an amenable number.

64978049 is a deficient number, since it is larger than the sum of its proper divisors (1).

64978049 is an equidigital number, since it uses as much as digits as its factorization.

64978049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 64978049 is about 8060.8962901156. The cubic root of 64978049 is about 402.0273097624.

The spelling of 64978049 in words is "sixty-four million, nine hundred seventy-eight thousand, forty-nine".